1,000 volunteers needed to unlock Diet's secrets for healthy aging

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Male or female (balanced sex ratio or at least 40% male to 60% female) in complete autonomy at home. * 55 to 75 years old, including the limits * 20 ≤ BMI ≤35 kg/m2 * Available to carry out the entire protocol, including self-sampling (not sensitive to the sight of one's own blood for example) and agreeing to stop taking food supplements during the study. * Having a scale available: at home, pharmacy, family, etc. * Having internet access and a device with a screen and camera (PC, tablet, smartphone, etc.) at home or able to go to a project partner (CCAS, Point France Service, Community, Association, etc.) that can provide this access * Subject agreeing to give written consent (by phone or videoconferencing), and registration in the national file of volunteers who participate in research * Person declaring to be subject to a social security scheme. Exclusion Criteria: * Weight loss ≥ 5% in 1 month or ≥ 10% in 6 months or ≥ 10% compared to usual weight * Treated diabetes * Sub-acute pathology (flu, gastroenteritis, bacterial infection, etc.) or trauma (fracture, surgical intervention, etc.) in the 30 days prior to inclusion. * Hepatocellular insufficiency, * Heart failure with decompensation, * Renal insufficiency (clearance \<30 ml/min) * Chronic anti-inflammatory treatment, long-term corticosteroid therapy \> 1 month, infiltration * Progressive pathology at the time of inclusion (cancer, etc.) * Gastrointestinal pathology deemed incompatible with the protocol * Unstable thyroid diseases * Recent change in eating habits in the last 30 days (weight loss diet, veganism, intermittent fasting, ketogenic diet, etc.) * Intense physical activity (activity causing shortness of breath and sweating) \> 10 hours per week * Person in a period of exclusion from the National File of Healthy Volunteers * Subject under guardianship, curator-ship, deprived of liberty or under judicial protection